550Doug
Member
- Location
- Southern Ontario
What can explain the appearance of gasoline in the oil of a Kholer Command Pro engine that is about 12hp?
- Thread starter 550Doug
- Start date
Michael Soldan
Well-known Member
Carb float not set right is flooding gasoline into the engine cylinders , washing down the walls of the cylinder and contaminating the oil , . carb set too rich , a cylinder not firing and the fuel charge going into it is contaminating the oil. Cold weather , choke on too long , running full throttle before engine has warmed up. All are possibilities .
teddy52food
Well-known Member
Gravity feed or fuel pump? Carb leaking or fuel pump leaking?
Mutt and Jeff
Member
Appearance?
a hint or some other scientific determination
smell?
over flowing out every nook and cranny?
I never knew gas to have much in the "appearance" category myself.
a hint or some other scientific determination
smell?
over flowing out every nook and cranny?
I never knew gas to have much in the "appearance" category myself.
Part Time Pete
Well-known Member
- Location
- Leatherstocking Region NY
I may be mistaken, but I think to use the word appearance for the presence of gasoline in the oil would be considered grammatically correct..
I think those engines use a pulse fuel pump, so it wouldn't come from there - my guess would be a carburetor issue
pete
I think those engines use a pulse fuel pump, so it wouldn't come from there - my guess would be a carburetor issue
pete
Part Time Pete
Well-known Member
- Location
- Leatherstocking Region NY
Actually, I take that back. I have an 18hp that has a pulse pump, but my brother has a 13hp that has a mechanical pump, do it could be coming from there
Pete
SodBuster87
Member
My sister years ago had a car that did this very same thing. Ended up being a fuel pressure regulator. *But* back on topic..... Out of curiosity when your engine sits a while does it hydro lock?
SARG
Member
- Location
- Upstate New York
Just a suggestion ..... I learned the hard way to install fuel shut-offs on all my small tractors (5) because of the issue you describe. The needle valve in the carbs don't function as a proper shut off and the contaminated engine oil turns into your tractor into a rolling bomb. You get get them in bulk on ebay.... both 90 degree and straight.
If it happens while the unit is sitting, most likely its from the needle valve in the carburetor leaking. fuel flows into the intake, past
the valves, into the cylinder where it works past the piston rings and into the engine crankcase, where it mixes with the oil. We see lots
of cases of this happening every year at the shop where I work.
The other senario is a leaking fuel pump diaphragm. both mechanical and pulse type fuel pumps with leaky diaphragms can permit fuel to flow
into the engine crankcase. This can happen while the engine runs too, as well as when it is stored.
the valves, into the cylinder where it works past the piston rings and into the engine crankcase, where it mixes with the oil. We see lots
of cases of this happening every year at the shop where I work.
The other senario is a leaking fuel pump diaphragm. both mechanical and pulse type fuel pumps with leaky diaphragms can permit fuel to flow
into the engine crankcase. This can happen while the engine runs too, as well as when it is stored.
jimg.allentown
Well-known Member
I have a Craftsman lawn tractor with a 12.5hp Kohler command engine on it. They use a mechanical pump that is operated by the engine internals. If the diaphragm in that pump fails, it will allow gasoline into the crankcase. With the ethanol in the gas working on that diaphragm, it is more prone to failure than with non-ethanol gas.
i was told this is common on smaller engines especially like on air compressors on the back of trucks. all the shaking and vibrating when going down the road will cause it to leak into the combustion chamber then get past the rings ending up in the crankcase. As far as the hydro lock what do you mean? Like water in the combustion chamber? My brothers air compressor does it and the only thing I noticed was where the air cleaner cover is traps water and leaks into the combustion chamber. But its also a small engine 5hp or so.
550Doug
Member
- Location
- Southern Ontario
There is a rubber tube from the OHV cover to the carb that I suspect is supposed to suck fumes INTO the carb but may actually be working in reverse by sucking fuel from the carb into the crankcase. Is this possible?
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